A ball is launched into the sky at 19.5 feet per second from a 54.6 meter tall building. The equation

A ball is launched into the sky at 19.5 feet per second from a 54.6 meter tall building. The equation for the ball’s height, h, at time t seconds is h = -3.9t2 + 19.5t + 54.6. When will the ball strike the ground?

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